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On average, symptoms from E. coli O157:H7 infection develop within 3 to 4 days of eating contaminated food, with a range of 1 to 10 days. Symptoms usually include severe bloody diarrhea and abdominal cramps; sometimes the infection causes non-bloody diarrhea or no symptoms.
Most people recover without specific treatment in five to 10 days. Antibiotics should not be used for the treatment of E. coli 0157:H7 infection. Studies have shown that some antibiotics may increase the risk of complications.